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626236d9bc
Older Book-E cores, such as the PPC 440, support only msync (which has the same encoding as sync 0), but not any of the other sync forms. Newer Book-E cores, however, do support sync, and for performance reasons we should allow the use of the more-general form. This refactors msync use into its own feature group so that it applies by default only to older Book-E cores (of the relevant cores, we only have definitions for the PPC440/450 currently). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218923 91177308-0d34-0410-b5e6-96231b3b80d8